Enough is enough

i am thinking of leaving sky if they dont fix the fault i have my internet has been syncing @ 27339 usually it was syncing @ 40000 for the past fortnight and sky says theres a fault on the line engineer say the line is ok even just upgraded to sky pro last Saturday and now im getting the runner round by both the engineer and sky.
I cant get virgin media where im at living on newly built estate also been told by the engineer the max my line can take is 50 meg another engineer done line testing in the house no problems there he also done tests outside the house no problems there.

Sky had capped my line @27 meg some how he managed to get the cap off sky weren't willing at first ,
The engineer done line testing in the house no problems there he also done tests outside the house no problems there
.
Sky had capped my line @27 meg anyhow he got the cap off was getting 44 meg down last night put pc on this morning modem syncing at 34000 got on the phone to sky same old crap once again told the guy you are talking rubbish now (he says fault on the line yeah right ).

Now he says the line got to sync for seven days once again so if speeds don't improve in seven days and im not getting the 44 meg down as i was getting last night will be off btinfinity 2.
So if you guys got sky check your sync speed of your router on your routers on line page as speed tests are not very accurate, so sky does cap your speeds proven with 3 engineers they also say you have faults on your line proven false once again by 3 engineers